2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/21/2018 | 11:00 AM - 11:15 AM | TRENDS IN TRIBUTARY LOADING TO LAKE ERIE: THE IMPORTANCE OF DISSOLVED PHOSPHORUS | 420 B

TRENDS IN TRIBUTARY LOADING TO LAKE ERIE: THE IMPORTANCE OF DISSOLVED PHOSPHORUS

Lake Erie has been experiencing a recurrence of harmful algal blooms (HABs) in the western basin and an increase in hypoxia in the central basin. Data from the Maumee, Sandusky, and Raisin rivers collected by the National Center for Water Quality Research at Heidelberg University indicate this reeutrophication corresponds to a 2-fold increase in dissolved reactive phosphorus (DRP) loading from the mid-1990s to today. Yet, loads of total P (TP) have decreased slightly and nitrate-N have decreased more drastically over the same time period. Traditionally, TP is the most common form of P analyzed in water in part because of its stability, but also because historically much of the P entering the lake was from wastewater effluent where TP is primarily dissolved and bioavailable. Agricultural sources of TP tend to be composed primarily of particulate P (PP), which has low bioavailability. Measuring only TP in watersheds dominated by nonpoint sources of P can mask changes in the highly bioavailable dissolved portion of TP. Strategies to reduce P from western Lake Erie basin tributaries need to prioritize reductions of dissolved P in order to reduce the frequency of HABs.

Phosphorous
Watershed
Eutrophication

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Presenters/Authors

Laura Johnson (), Heidelberg University, ljohnson@heidelberg.edu;